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Module 5 of 5 · 20 min

Early-warning maintenance

Build a normal operating baseline and investigate sustained changes before they become unplanned downtime.

The situation

Illustrative scenario: a device appears to stop without warning on a fully booked day. Reviewing its earlier logs reveals a sustained change in consumption and longer start-up behaviour. Those signals might have supported an earlier inspection, although they do not identify the component or prove that the failure was predictable.

The common mistake: waiting for an obvious fault

Some faults are preceded by measurable changes in consumption, temperature, noise, runtime or error logs; others are not. A baseline makes sustained change easier to describe to a technician, but it does not replace manufacturer diagnostics, preventive maintenance or safety checks.

Planned review can reduce disruption when a real warning is identified. The business case depends on the device, service agreement, parts availability and consequence of downtime.

The method: establish and monitor a baseline

Define normal operation, then agree what should trigger a technical review.

  • Build the baseline: collect comparable readings for the same device, treatment and settings across enough sessions to describe normal variation.
  • Review sustained deviation: one unusual reading may be noise. Repeated differences outside the agreed operating range should be documented and reviewed.
  • Escalate safely: share dates, conditions, readings and device logs with a qualified technician. Follow manufacturer instructions immediately when a safety warning or fault code appears.

✎ Practical exercise · Record your baseline (20 min)

  1. 1Using the approved log or measurement method, calculate an initial consumption or runtime baseline for one device and one comparable treatment.
  2. 2Record the sample, settings, date range and normal variation rather than keeping only one average.
  3. 3Agree with the supplier or technician which conditions require observation, inspection or immediate shutdown.
  4. 4Add the baseline review to the centre’s maintenance process; do not use it as a substitute for scheduled servicing.

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